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EOrBAC - Based active directory management

EOrBAC - Based active directory management

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作者： Hassan, Ahmad A. Bahgat, Waleed M. Department of Computer Science and Informatics Taibah University Al Medina Al Munawara Saudi Arabia Department of Communications Misr Higher Institute for Engineering and Technology Al Mansoura Egypt

ISBN: (纸本)9780791802977

A corporate network consists of many individual network security components. Firewall, active directory, and IDS are some examples of these components. Each network security component has its own high level security policy which is translated into low level security mechanisms. There is a wide gap between high level and low level representation of security policy making enforcement of high level security policy faces some essential difficulties. Consistency, verification, and maintenance are the major ones of these difficulties. One approach to overcome these difficulties is to present security policy in an intermediate level and then automate the translation of the intermediate level security policy into low level security mechanisms. Extended Organization Based Access control (EOrBAC) model is valuable step towards introducing this intermediate level. One of the major advantages of EOrBAC is its ability to model most network security components. This paper extends the work of EOrBAC by applying its concept on active directory network security component. Also, an EOrBAC based network security management toolkit is developed to realize this approach.

关键词： Network security

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Optimal MBMS Power Allocation Exploiting MIMO in LTE Networks

Optimal MBMS Power Allocation Exploiting MIMO in LTE Network...

引用

IEEE Conference on Vehicular technology (VTC)

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Patras Greece

In the frame of the Long Term Evolution (LTE) of mobile networks, the provision of rich multimedia services, such as Mobile TV, is considered of key importance for the LTE proliferation in mobile market. To this end, Multimedia Broadcast/Multicast Service (MBMS) is envisaged to play an instrumental role during LTE standardization process. MBMS was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS) in order to deliver multimedia data from a single source entity to multiple destinations. However, downlink capacity in such networks is limited by base station transmission power. As an aftermath, in MBMS efficient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. In this paper we propose a power control scheme for efficient selection of MBMS bearers. The proposed mechanism on the one hand manages to economically utilize power resources during MBMS transmissions, while on the other hand exploits the performance enhancements emerged from Multiple Input Multiple Output (MIMO) antennas used in LTE networks. Simulation results indicate that the proposed scheme results to significant power and capacity improvements.

关键词： MIMO Long Term Evolution Mobile TV Digital multimedia broadcasting Multimedia communication TV broadcasting Instruments Standardization 3G mobile communication Multimedia systems

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Video transmission over TFRC using cross-layer power management

Video transmission over TFRC using cross-layer power managem...

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International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Christos Bouras Apostolos Gkamas Vaggelis Kapoulas Vassilis Papapanagiotou Kostas Stamos Giannis Zaoudis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

ISBN: (纸本)9781424449736

This paper presents the issues related to efficient transmission of encoded video (such as H.264) over wireless links using the TFRC protocol. It proposes a novel mechanism that utilizes cross-layer approaches for adaptation of the power transmission level of the sender and feedback information regarding the wireless connection status from the receiver for improved transmission statistics and therefore user experience without unnecessary power consumption. The mechanism is tested through simulations using ns2. Compared to the operation of the video transmission without the mechanism, we observe that it has benefits in terms of video quality.

关键词： Energy management Wireless networks Energy consumption Throughput Wireless application protocol Power engineering computing Propagation losses Signal to noise ratio Fading Interference

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An enhanced MBMS power control mechanism towards Long Term Evolution

An enhanced MBMS power control mechanism towards Long Term E...

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Wireless Telecommunications Symposium, WTS

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Patras Greece

Long Term Evolution (LTE) promises the delivery of rich multimedia services in a more power and spectral efficient way than its predecessor Universal Mobile Telecommunication System (UMTS). To this direction, the newly introduced Enhanced - Multimedia Broadcast/Multicast Service (E-MBMS) framework is envisaged to play a fundamental role during the LTE standardization. E-MBMS constitutes the successor of MBMS which was introduced in the Release 6 of UMTS in order to deliver multimedia data from a single source entity to multiple destinations. This paper proposes a novel mechanism for efficient radio bearer selection during E-MBMS transmissions in LTE networks. The proposed mechanism is based on the concept of transport channels combination (point-to-point and/or point-to-multipoint radio bearers) in any cell/sector of the network in which multicast users are residing. The mechanism is evaluated through several realistic scenarios and is compared with several radio bearer selection mechanisms in order to highlight the enhancements that it provides.

关键词： Power control Long Term Evolution 3G mobile communication Streaming media Power engineering computing Downlink Base stations Multimedia communication Power engineering and energy informatics

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EOrBAe based network security management toolkit

EOrBAe based network security management toolkit

引用

2009 IFIP International Conference on Wireless and Optical Communications Networks, WOCN 2009

作者： Hassan, Ahmad A. Bahgat, Waleed M. Ibrahim, Abdel Fatah Department of Computer Science and Informatics Taibah University Al Medina Al Munawara Saudi Arabia Department of Communications Misr Engineering and Technology Institute Al Mansoura Egypt Communications and Electronics Engineering Department Mansoura University Al Mansoura Egypt

ISBN: (纸本)9781424434749

Because of the growing complexity of networks and the difficult task of security policy enforcement, system administrators need simple and powerful security management tools. This paper presents a network security management tool that allows policy specification and administration of network security components such as firewall. The tool consists of four main modules. First module is considered the network repository of our toolkit. Through the second module the security policy is introduced and the necessary validation and verification is done by a policy engine. The third module is responsible for the translation of the high level security policy into an intermediate model level. Finally, the intermediate level is translated automatically into a vendor-specific security mechanism through the vendor specific compiler.©2009 IEEE.

关键词： Network security

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A Service-Transparent and Self-Organized Optical Network Architecture

A Service-Transparent and Self-Organized Optical Network Arc...

引用

IEEE International Conference on Communications (ICC)

作者： K. Vlachos A. Siokis Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, a new service oriented networking paradigm is presented, where network nodes (peers) are self- organized into individual service entities. The key idea relies on the overlay approach, where there exists a virtual service plane, fragmented into self-organized and self-managed entities called islands of service transparency. The islands are formed in an upstream, ad-hoc mode from the non-networking resources (i.e VoD, grid server, etc) towards all ingress routers of the network, using link state advertisements and multi-cost path selection algorithms (i.e residual bandwidth, server capacity, storage, etc). Organization and re-organization of nodes around non-network resources is transparent to end-users, and thus any request within a specific service island is transparently routed to the island's resource for execution. A service proxy is commissioned to resolve service addresses and service attributes to QoS metrics. In this paper, we present the main notations and metrics of the proposed architecture as well as node behavior and potential GMPLS extensions for implementation issues.

关键词： Optical fiber networks Peer to peer computing computer networks Optical computing Network servers Bandwidth Communications Society computer architecture informatics Open systems

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A combined TCP aware scheduling and assembly scheme for OBS networks

A combined TCP aware scheduling and assembly scheme for OBS ...

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International Conference on Broadband Networks (BroadNets)

作者： Kostas ramantas Kyriakos Vlachos Computer Engineering and Informatics Department &Research Academic Computer Technology Institute University of Patras Rio Greece

The efficient transmission of TCP traffic over OBS networks is a challenging problem, due to the high sensitivity of TCP congestion control mechanism to losses. In this work, we propose solutions to this problem, through the burst assembly and scheduling mechanism of OBS. We investigate and propose algorithms to achieve performance enhancements for TCP traffic by taking into account TCP state information. We prove our claims with references to well-established TCP models, and validate the proposed algorithms through simulations.

关键词： Assembly Scheduling algorithm Communication system traffic control Delay Protocols Throughput Traffic control Optical sensors computer networks Propagation losses

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Cross layer RWA in WDM networks: Is the added complexity useful or a burden?

Cross layer RWA in WDM networks: Is the added complexity use...

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International Conference on Transparent Optical Networks

作者： K. Christodoulopoulos P. Kokkinos K. Manousakis E. A. Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patra Greece

ISBN: (纸本)9781424448258

In transparent wavelength routed optical networks, the signal quality degrades due to physical layer impairments. Certain physical effects make routing decisions made for one lightpath affect and be affected by the decisions for other lightpaths. To safely establish a lightpath for a new connection two main approaches can be used. The most common approach is to select a lightpath that has acceptable transmission quality under the worst case interference assumption. This ensures that the selected lightpath will not become infeasible due to the possible establishment of future interfering connections, but it sacrifices candidate path space for a quick and stable lightpath selection process. The second approach is to consider the actual current network utilization and account for the interference among lightpaths so as to perform a cross layer optimization between the network and physical layers. In the latter approach, the algorithm has to evaluate and check if the establishment of the new lightpath turns infeasible some of the already established connections. The question that arises is whether the performance benefits obtained through the second approach are worth the added complexity introduced by the cross-layer optimization required.

关键词： Cross layer design WDM networks Physical layer Interference computer networks Optical computing Physics computing Wavelength routing Optical fiber networks Degradation

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Multi-Parametric Online RWA Based on Impairment Generating Sources

Multi-Parametric Online RWA Based on Impairment Generating S...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： P. Kokkinos K. Christodoulopoulos K. Manousakis E. A. Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patra Greece

We propose and evaluate an impairment-aware multi-parametric routing and wavelength assignment algorithm for online traffic in transparent optical networks. In such networks the signal quality of transmission degrades due to physical layer impairments. In the multi-parametric approach, a vector of cost parameters is assigned to each link, from which the cost vectors of candidate lightpaths are calculated. In the proposed scheme the cost vector includes impairment generating source parameters, such as the path length, the number of hops, the number of crosstalk sources and other inter-lightpath interfering parameters, so as to indirectly account for the physical layer effects. For a requested connection the algorithm calculates a set of candidate lightpaths, whose quality of transmission is validated using a function that combines the impairment generating parameters. For selecting the lightpath we propose and evaluate various optimization functions that correspond to different IA-RWA algorithms. Our performance results indicate that the proposed algorithms utilize efficiently the available resources and minimize the total accumulated signal degradation on the selected lightpaths, while having low execution times.

关键词： Costs Optical fiber networks Physical layer Degradation Repeaters Optical receivers computer networks Optical computing Wavelength routing Wavelength assignment

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An Efficient Mechanism for Power Control Optimization in MBMS Enabled UTraN

An Efficient Mechanism for Power Control Optimization in MBM...

引用

IEEE Conference on Wireless Communications and Networking

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Research Academic Computer Technology Institute Patras Greece and Computer Engineering and Informatics Department University of Patras Greece

This paper proposes a power control mechanism for the efficient radio bearer selection in the multimedia broadcast/multicast service (MBMS) framework of Universal Mobile Telecommunications System (UMTS). The selection of the most efficient transport channel in terms of power consumption is a key point for MBMS enabled UMTS networks, since a wrong transport channel selection for the transmission of the MBMS data could result to a significant decrease in the total capacity of the network. Different UMTS transport channels and power saving techniques are examined and an algorithm that selects the most efficient combination of the above parameters is proposed. The proposed MBMS power control mechanism selects the transport channel that minimizes the base station's transmission power in every cell of the network that serves multicast users.

关键词： Power control 3G mobile communication Multimedia communication Power engineering computing Telecommunication computing Digital multimedia broadcasting Broadcast technology Resource management radio access networks Speech analysis

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